INSTALLATION INSTRUCTIONS 13 & 14.5 SEER SERIES HEAT PUMPS 1 1 2-5 TONS FEATURING NEW INDUSTRY STANDARD R-410A REFRIGERANT R-410! RECOGNIZE THIS SYMBOL AS AN INDICATION OF IMPORTANT SAFETY INFORMATION!! WARNING THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED, LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION, ADJUSTMENT AND OPERATION OF THIS UNIT. READ THESE INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR OPERATION. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION, ADJUSTMENT, SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. ISO 9001:2008 DO NOT DESTROY THIS MANUAL PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE REFERENCE BY A SERVICEMAN 92-20522-75-01 SUPERSEDES 92-20522-75-00
TABLE OF CONTENTS 1.0 SAFETY INFORMATION............................................ 3 2.0 GENERAL INFORMATION.......................................... 4 2.1 Checking Product Received...................................... 4 2.2 Applications.................................................. 4 2.3 Dimensions.................................................. 5 2.4 Electrical and Physical Data..................................... 6 3.0 LOCATING UNIT.................................................. 6 3.1 Corrosive Environment......................................... 6 3.2 Heat Pump Location........................................... 7 3.3 Operational Issues............................................. 7 3.4 For Units With Space Limitations.................................. 7 3.5 Customer Satisfaction Issues.................................... 8 3.6 Unit Mounting................................................. 8 3.7 Factory-Preferred Tie-Down Method............................... 8 4.0 REFRIGERANT CONNECTIONS.................................... 10 5.0 REPLACEMENT UNITS............................................ 10 6.0 INDOOR COIL................................................... 10 6.1 Location.................................................... 10 7.0 INTERCONNECTING TUBING...................................... 11 7.1 Vapor & Liquid Lines.......................................... 11 7.2 Maximum Length of Lines...................................... 11 7.3 Vertical Separation........................................... 11 7.4 Tubing Installation............................................ 11 7.5 Tubing Connections........................................... 12 7.6 Leak Testing................................................ 12 8.0 DEMAND DEFROST CONTROL..................................... 15 8.1 Defrost Initiation.............................................. 15 8.2 Defrost Termination........................................... 15 8.3 Temperature Sensors......................................... 15 8.4 Test Mode.................................................. 15 8.5 Trouble Shooting Demand Defrost Operation....................... 15 8.6 High/Low Pressure Control Monitoring............................ 16 8.7 Enhanced Feature Defrost Control Diagnostic Codes................. 16 9.0 EVACUATION PROCEDURE....................................... 16 10.0 START UP & PERFORMANCE...................................... 17 11.0 CHECKING AIRFLOW............................................. 17 12.0 CHECKING REFRIGERANT CHARGE................................ 17 12.1 Charging By Liquid Pressure.................................... 17 12.2 Charging By Weight........................................... 18 12.3 Final Leak Testing............................................ 18 13.0 ELECTRICAL WIRING............................................. 18 13.1 Power Wiring................................................ 18 13.2 Grounding.................................................. 18 13.3 Control Wiring............................................... 19 14.0 FIELD INSTALLED ACCESSORIES.................................. 19 14.1 Compressor Crankcase Heat.................................... 19 14.2 Low Ambient Control.......................................... 20 14.3 High Pressure Control......................................... 20 14.4 Heat Pump Thermostat Warning Light Kit RXPX-D01................. 20 15.0 SERVICE....................................................... 20 15.1 Single Pole Compressor Contactor............................... 20 16.0 TROUBLESHOOTING............................................. 21 16.1 Electrical Checks Flow Chart.................................... 21 16.2 Cooling Mechanical Checks Flow Chart........................... 22 16.3 Heating Mechanical Checks Flow Chart........................... 23 16.4 Defrost Mechanical Checks Flow Chart............................ 24 16.5 Subcooling Calculation........................................ 25 16.6 General Troubleshooting Chart.................................. 26 16.7 Service Analyzer Chart........................................ 27 17.0 WIRING DIAGRAMS.............................................. 32 17.1 Enhanced Defrost Control - PSC Motor............................ 32 17.2 Enhanced Defrost Control - ECM Motor........................... 33 2
1.0 SAFETY INFORMATION! WARNING Disconnect all power to unit before starting maintenance. Failure to do so can cause electrical shock resulting in severe personal injury or death.! WARNING Turn off electric power at the fuse box or service panel before making any electrical connections. Also, the ground connection must be completed before making line voltage connections. Failure to do so can result in electrical shock, severe personal injury or death.! WARNING These instructions are intended as an aid to qualified licensed service personnel for proper installation, adjustment and operation of this unit. Read these instructions thoroughly before attempting installation or operation. Failure to follow these instructions may result in improper installation, adjustment, service or maintenance possibly resulting in fire, electrical shock, property damage, personal injury or death.! WARNING The unit must be permanently grounded. Failure to do so can cause electrical shock resulting in severe personal injury or death.! WARNING The manufacturer s warranty does not cover any damage or defect to the heat pump caused by the attachment or use of any components. Accessories or devices (other than those authorized by the manufacturer) into, onto or in conjunction with the heat pump. You should be aware that the use of unauthorized components, accessories or devices may adversely affect the operation of the heat pump and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized components, accessories or devices. CAUTION When coil is installed over a finished ceiling and/or living area, it is recommended that a secondary sheet metal condensate pan be constructed and installed under entire unit. Failure to do so can result in property damage. CAUTION Single-pole contactors are used on all standard single-phase units up through 5 tons. Caution must be exercised when servicing as only one leg of the power supply is broken with the contactor. 3
2.0 GENERAL! WARNING The manufacturer s warranty does not cover any damage or defect to the heat pump caused by the attachment or use of any components. Accessories or devices (other than those authorized by the manufacturer) into, onto or in conjunction with the heat pump. You should be aware that the use of unauthorized components, accessories or devices may adversely affect the operation of the heat pump and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized components, accessories or devices. 2.1 CHECKING PRODUCT RECEIVED Upon receiving unit, inspect it for any shipping damage. Claims for damage, either apparent or concealed, should be filed immediately with the shipping company. Check heat pump model number, electrical characteristics and accessories to determine if they are correct. Check system components (evaporator coil, condensing unit, evaporator blower, etc.) to make sure they are properly matched.the information contained in this manual has been prepared to assist in the proper installation, operation and maintenance of the heat pump system. Improper installation, or installation not made in accordance with these instructions, can result in unsatisfactory operation and/or dangerous conditions, and can cause the related warranty not to apply. Read this manual and any instructions packaged with separate equipment required to make up the system prior to installation. Retain this manual for future reference. To achieve optimum efficiency and capacity, the indoor cooling coils listed in the heat pump specification sheet should be used. MATCH ALL COMPONENTS: OUTDOOR UNIT INDOOR COIL/METERING DEVICE INDOOR AIR HANDLER/FURNACE REFRIGERANT LINES 2.2 APPLICATION Before installing any heat pump equipment, a duct analysis of the structure and a heat gain calculation must be made. A heat gain calculation begins by measuring all external surfaces and openings that gain heat from the surrounding air and quantifying that heat gain. A heat gain calculation also calculates the extra heat load caused by sunlight and by humidity removal. There are several factors that the installers must consider: Outdoor unit location Proper equipment evacuation System refrigerant charge Indoor unit airflow Indoor unit blower speed Supply and return air duct design and sizing System air balancing Diffuser and return air grille location and sizing 4
2.3 DIMENSIONS (SEE FIGURE 1) FIGURE 1 DIMENSIONS A-00008 w AIR DISCHARGE: ALLOW 60 [1524 mm] MINIMUM CLEARANCE. L AIR INLETS (LOUVERED PAN- ELS) ALLOW 6 [152.4 mm] MINIMUM CLEARANCE H SERVICE ACCESS ALLOW 24 [609.6 mm] CLEARANCE NOTE: GRILLE APPEARANCE MAY VARY. SEE DETAIL A 2" [50.8 mm] BASERAIL* *The 3, 3 1 2, 4 & 5 ton models do not feature a baserail. DIMENSIONAL DATA 13 SEER 18, 24 30 36 BASE PAN (BOTTOM VIEW) DO NOT OBSTRUCT DRAIN HOLES (SHADED). 42, 48, 60 14.5 SEER 18, 24 30 36, 42, 48, 60 Height H (in.) [mm] Length L (in.) [mm] Width W (in.) [mm] 26 1 /4 [666.7] 26 1 /4 [666.7] 26 1 /4 [666.7] 23 5 /8 [600] 27 5 /8 [701.6] 27 5 /8 [701.6] 23 5 /8 [600] 27 5 /8 [701.6] 27 5 /8 [701.6] 27 3 /8 [695.3] 35 3 /8 [898.5] 31 5 /8 [803.2] 31 5 /8 [803.2] 31 5 /8 [803.2] 31 5 /8 [803.2] 5
2.4 ELECTRICAL & PHYSICAL DATA (SEE TABLE 1) TABLE 1 ELECTRICAL AND PHYSICAL DATA 13 SEER Model Number Model Number Compressor Phase Frequency (Hz) Rated Load Locked Rotor Voltage (Volts) Amperes (RLA) Amperes (LRA) Compressor Phase Frequency (Hz) Rated Load Locked Rotor Voltage (Volts) Amperes (RLA) Amperes (LRA) NOTES: ➀ 20 Fins per inch [mm] ➁ Factory charged for 15 ft. [4.6 m] of line set ELECTRICAL DATA Fan Motor Full Load Amperes (FLA) ELECTRICAL DATA Fan Motor Full Load Amperes (FLA) Minimum Circuit Ampacity Amperes Minimum Circuit Ampacity Amperes Fuse or HACR Circuit Breaker Minimum Amperes Fuse or HACR Circuit Breaker Minimum Amperes Maximum Amperes Maximum Amperes Face Area Sq. Ft. [m 2 ] Face Area Sq. Ft. [m 2 ] Outdoor Coil Outdoor Coil No. Rows CFM [L/s] PHYSICAL DATA Refrig. Per Circuit Oz. [g] Net Lbs. [kg] Weight Shipping Lbs. [kg] Rev. 7/29/2009 18 1-60-208/230 9/9 48 0.08 13/13 15/15 20/20 13.72 [1.27] 1 2590 [1222] 101.6 [2880] 154 [69.9] 164 [74.4] 24 1-60-208/230 12.8/12.8 58.3 0.08 17/17 25/25 25/25 13.72 [1.27] 1 2590 [1222] 100.8 [2858] 155 [70.3] 165 [74.8] 30 1-60-208/230 14.1/14.1 73 1.23 19/19 25/25 30/30 16.39 [1.52] 1 2595 [1225] 117.8 [3340] 118.5 [53.8] 181 [82.1] 36 1-60-208/230 16.7/16.7 79 1.3 23/23 30/30 35/35 21.85 [2.03] 1 3575 [1687] 136.5 [3870] 193 [87.5] 207 [93.9] 42 1-60-208/230 17.9/17.9 112 1.33 24/24 30/30 40/40 21.85 [2.03] 1 3575 [1687] 162.4 [4604] 193 [87.5] 208 [94.3] 48 1-60-208/230 21.8/21.8 117 2.8 31/31 40/40 50/50 21.85 [2.03] 2 3360 [1586] 258.4 [7326] 265 [120.2] 280 [127] 60 1-60-208/230 26.4/26.4 134 2.8 36/36 45/45 60/60 21.85 [2.03] 2 3360 [1586] 284 [8051] 265 [120.2] 280 [127] No. Rows CFM [L/s] PHYSICAL DATA Refrig. Per Circuit Oz. [g] Net Lbs. [kg] Weight Shipping Lbs. [kg] Rev.7/29/2009 18 1-60-208-230 9/9 48 0.6 12/12 15/15 20/20 11.06 [1.03] 1 1700 [802] 91 [2580] 144 [65.3] 152 [68.9] 24 1-60-208-230 12.8/12.8 58.3 0.6 17/17 20/20 25/25 11.06 [1.03] 1 2370 [1118] 91 [2580] 130 [59] 138 [62.6] 30 1-60-208-230 14.1/14.1 73 0.8 19/19 25/25 30/30 13.72 [1.27] 1 2800 [1321] 101 [2863] 198 [89.8] 208 [94.3] 36 1-60-208-230 17/17 96.7 1.2 23/23 30/30 35/35 16.39 [1.52] 1 3575 [1687] 109 [3090] 215 [97.5] 227 [103] 42 1-60-208-230 21.8/21.8 112 1.2 29/29 35/35 50/50 21.85 [2.03] 1 3575 [1687] 150 [4252] 202 [91.6] 214 [97.1] 48 1-60-208-230 21.8/21.8 117 1.2 29/29 35/35 50/50 21.85 [2.03] 1 3575 [1687] 141 [3997] 205 [93] 217 [98.4] 60 1-60-208-230 26.3/26.3 134 1.2 35/35 45/45 60/60 21.85 [2.03] 1 3575 [1687] 228 [6464] 209 [94.8] 221 [100.2] ELECTRICAL AND PHYSICAL DATA 14.5 SEER 3.0 LOCATING UNIT 3.1 CORROSIVE ENVIRONMENT The metal parts of this unit may be subject to rust or deterioration if exposed to a corrosive environment. This oxidation could shorten the equipment s useful life. Corrosive elements include, but are not limited to, salt spray, fog or mist in seacoast areas, sulphur or chlorine from lawn watering systems, and various chemical contaminants from industries such as paper mills and petroleum refineries. If the unit is to be installed in an area where contaminants are likely to be a problem, special attention should be given to the equipment location and exposure. Avoid having lawn sprinkler heads spray directly on the unit cabinet. In coastal areas, locate the unit on the side of the building away from the waterfront. Shielding provided by a fence or shrubs may give some protection, but cannot violate minimum airflow and service access clearances. Elevating the unit off its slab or base enough to allow air circulation will help avoid holding water against the basepan. Regular maintenance will reduce the build-up of contaminants and help to protect the unit s finish. 6
! WARNING Disconnect all power to unit before starting maintenance. Failure to do so can cause electrical shock resulting in severe personal injury or death. Frequent washing of the cabinet, fan blade and coil with fresh water will remove most of the salt or other contaminants that build up on the unit. Regular cleaning and waxing of the cabinet with an automobile polish will provide some protection. A liquid cleaner may be used several times a year to remove matter that will not wash off with water. Several different types of protective coil coatings are offered in some areas. These coatings may provide some benefit, but the effectiveness of such coating materials cannot be verified by the equipment manufacturer. 3.2 HEAT PUMP LOCATION Consult local and national building codes and ordinances for special installation requirements. Following location information will provide longer life and simplified servicing of the outdoor heat pump. NOTE: These units must be installed outdoors. No ductwork can be attached, or other modifications made, to the discharge grille. Modifications will affect performance or operation. 3.3 OPERATIONAL ISSUES IMPORTANT: Locate the unit in a manner that will not prevent, impair or compromise the performance of other equipment horizontally installed in proximity to the unit. Maintain all required minimum distances to gas and electric meters, dryer vents, exhaust and inlet openings. In the absence of National Codes, or manufacturers recommendations, local code recommendations and requirements will take presidence. Refrigerant piping and wiring should be properly sized and kept as short as possible to avoid capacity losses and increased operating costs. Locate the unit where water run off will not create a problem with the equipment. Position the unit away from the drip edge of the roof whenever possible. Units are weatherized, but can be affected by the following: o Water pouring into the unit from the junction of rooflines, without protective guttering. Large volumes of water entering the heat pump while in operation can impact fan blade or motor life, and coil damage may occur to a heat pump if moisture cannot drain from the unit under freezing conditions. o Freezing moisture, or sleeting conditions, can cause the cabinet to ice-over prematurely and prevent heat pump operation, requiring backup heat, which generally results in less economical operation. Closely follow clearance recommendations (See Figure 1). o 24 [609.6 mm] to the service panel access o 60 [1524 mm] above heat pump fan discharge (unit top) to prevent recirculation o 6 [152.4 mm] to heat pump coil grille air inlets (per heat pump). 3.4 FOR UNITS WITH SPACE LIMITATIONS In the event that a space limitation exists, we will permit the following clearances: Single Unit Applications: Clearances below 6 inches [152.4 mm] will reduce unit capacity and efficiency. Do not reduce the 60-inch [1524 mm] discharge, or the 24- inch [609.6 mm] service clearances. Multiple Unit Applications: When multiple heat pump grille sides are aligned, a 6- inch [152.4 mm] per unit clearance is recommended, for a total of 12" [304.8 mm] between two units. Two combined clearances below 12 inches [304.8 mm] will reduce capacity and efficiency. Do not reduce the 60-inch [1524 mm] discharge, or 24-inch [609.6 mm] service, clearances. 7
FIGURE 2 RECOMMENDED ELEVATED INSTALLATION Do not obstruct the bottom drain opening in the heat pump base pan. It is essential to provide defrost condensate drainage to prevent possible refreezing of the condensation. Provide a base pad for mounting the unit, which is slightly pitched away from the structure. Route condensate off the base pad to an area which will not become slippery and result in personal injury. Where snowfall is anticipated, the heat pump must be elevated above the base pad to prevent ice buildup that may crush the tubing of the heat pump coil or cause fin damage. Heat pump units should be mounted above the average expected accumulated snowfall for the area. 3.5 CUSTOMER SATISFACTION ISSUES The heat pump should be located away from the living, sleeping and recreational spaces of the owner and those spaces on adjoining property. To prevent noise transmission, the mounting pad for the outdoor unit should not be connected to the structure, and should be located sufficient distance above grade to prevent ground water from entering the unit. 3.6 UNIT MOUNTING If elevating the heat pump, either on a flat roof or on a slab, observe the following guidelines. The base pan provided elevates the heat pump 2 [50.8 mm] above the base pad. If elevating a unit on a flat roof, use 4 x 4 [101.6 mm x 101.6 mm] (or equivalent) stringers positioned to distribute unit weight evenly and prevent noise and vibration (see Figure 2). NOTE: Do not block drain openings shown in Figure 1. If unit must be elevated because of anticipated snow fall, secure unit and elevating stand such that unit and/or stand will not tip over or fall off. Keep in mind that someone may try to climb on unit. 3.7 FACTORY-PREFERRED TIE-DOWN METHOD INSTRUCTIONS: IMPORTANT: These instructions are intended as a guide to securing equipment for windload ratings of 120 MPH sustained wind load and 3-second, 150 MPH gust. While this procedure is not mandatory, the Manufacturer does recommend that equipment be properly secured in areas where high wind damage may occur. STEP 1: Before installing, clear pad of any dirt or debris. IMPORTANT: The pad must be constructed of industry-approved materials, and must be thick enough to accommodate the concrete fastener. 8
FIGURE 3 TIE-DOWN KIT ASSEMBLY VIEW C VIEW B VIEW D NOTE: 13 SEER MODELS 18/24 30 36/42/48/60 14.5 SEER MODELS 18/24 30/36/42/ 48/60 TIE DOWN TIE DOWN ASSEMBLY DIMENSIONS ASSEMBLY VIEW L W A B C D E F C D B 23.63 [600] 27.63 [701.8] 31.63 [803.4] 23.63 [600] 27.63 [701.8] 31.63 [803.4] 3.5 [88.9] 5 [127] 5.63 [143] 18.63 [473.2] 21.13 [536.7] 24.5 [622.3] 1.94 [49.7] 2.75 [69.8] 5.63 [143] 20.19 [512.8] 23.38 [593.8] 24.5 [622.3] CENTER LINE OF UNIT CENTER LINE OF UNIT CENTER LINE OF UNIT CENTER LINE OF UNIT CENTER LINE OF UNIT CENTER LINE OF UNIT 9
STEP 2: Center basepan on pad, ensuring it is level. STEP 3: Remove unit top panel by removing screws around the perimeter of top panel. Disconnect fan motor leads from contactor and lay top panel aside taking care not to damage the fan. STEP 4: Drill 4 or 6 holes (1/4 [6.35 mm] diameter) in the unit basepan only per figure 3. STEP 5: Select and obtain appropriate concrete or lag screws and flat washers per figure 3. STEP 6: Drill pilot holes in pad through the basepan clearance holes drilled in Step 4, ensuring that the holes are at least 1 4 [6.35 mm] deeper than the concrete fastener being used. Use the concrete screw or lag screw manufacturer s recommended hole diameter for the pilot holes. STEP 7: Drive concrete screws or lag screws through 1 4 [6.35 mm] clearance holes in unit base-pan and into the pad. Use flat washers under the head of the screws. Snug screws to basepan. NOTE: Do not over-tighten the concrete or lag screws. Doing so can weaken or strip the fastener and cause it to break or pull out. STEP 8: Re-connect fan motor wire leads to contactor per the unit wiring diagram and lower unit top onto the unit. Take care to place the fan motor wire conduit in the slot in the top of the control box as the top is lowered onto the unit. Re-install screws that attach unit top to the unit. STEP 9: Finish unit installation per Sections 4-14 in this manual. 4.0 REFRIGERANT CONNECTIONS All units are factory charged with Refrigerant 410A for 15 ft. [4.6 m] of line set. All models are supplied with service valves. Keep tube ends sealed until connection is to be made to prevent system contamination. 5.0 REPLACEMENT UNITS To prevent failure of a new heat pump unit, the existing tubing system must be correctly sized and cleaned or replaced. Care must be exercised that the expansion device is not plugged. For new and replacement units, a liquid line filter drier should be installed and refrigerant tubing should be properly sized. Test the oil for acid. If positive, a liquid line filter drier is mandatory. 6.0 INDOOR COIL REFER TO INDOOR COIL MANUFACTURER S INSTALLATION INSTRUCTIONS. IMPORTANT: The manufacturer is not responsible for the performance and operation of a mismatched system, or for a match listed with another manufacturer s coil. 6.1 LOCATION Do not install the indoor coil in the return duct system of a gas or oil furnace. Provide a service inlet to the coil for inspection and cleaning. Keep the coil pitched toward the drain connection. CAUTION When coil is installed over a finished ceiling and/or living area, it is recommended that a secondary sheet metal condensate pan be constructed and installed under entire unit. Failure to do so can result in property damage. 10
7.0 INTERCONNECTING TUBING 7.1 VAPOR AND LIQUID LINES Keep all lines sealed until connection is made. Make connections at the indoor coil first. Refer to Line Size Information in Tables 2 and 3 for correct size and multipliers to be used to determine capacity for various vapor line diameters and lengths of run. The losses due to the lines being exposed to outdoor conditions are not included. The factory refrigeration charge in the outdoor unit is sufficient for 15 feet [4.6 m] of interconnecting lines. The factory refrigeration charge in the outdoor unit is sufficient for the unit and 15 feet [4.6 m] of standard size interconnecting liquid and vapor lines. For different lengths, adjust the charge as indicated below. 1/4 ±.3 oz. per foot [6.35 mm ± 8.5 g] 5/16 ±.4 oz. per foot [7.9 mm ± 11.3 g] 3/8 ±.6 oz. per foot [9.5 mm ± 17 g] 1/2 ± 1.2 oz. per foot [12.7 mm ± 34 g] 7.2 MAXIMUM LENGTH OF LINES The maximum length of interconnecting line is 150 feet [45.7 m]. Always use the shortest length possible with a minimum number of bends. Additional compressor oil is not required for any length up to 150 feet [45.7 m]. NOTE: Excessively long refrigerant lines cause loss of equipment capacity. 7.3 VERTICAL SEPARATION Keep the vertical separation to a minimum. Use the following guidelines when installing the unit: 1. DO NOT exceed the vertical separations as indicated on Table 3. 2. It is recommended to use the smallest liquid line size permitted to minimize system charge which will maximize compressor reliability. 3. Table 3 may be used for sizing horizontal runs. 7.4 TUBING INSTALLATION Observe the following when installing correctly sized type L refrigerant tubing between the condensing unit and evaporator coil: If a portion of the liquid line passes through a hot area where liquid refrigerant can be heated to form vapor, insulating the liquid line is required. Use clean, dehydrated, sealed refrigeration grade tubing. Always keep tubing sealed until tubing is in place and connections are to be made. Blow out the liquid and vapor lines with dry nitrogen before connecting to the outdoor unit and indoor coil. Any debris in the line set will end up plugging the expansion device. As an added precaution it is recommended that a high quality, bi-directional filter drier is installed in the liquid line. Do not allow the vapor line and liquid line to be in contact with each other. This causes an undesirable heat transfer resulting in capacity loss and increased power consumption. The vapor line must be insulated. If tubing has been cut, make sure ends are deburred while holding in a position to prevent chips from falling into tubing. Burrs such as those caused by tubing cutters can affect performance dramatically, particularly on small liquid line sizes. For best operation, keep tubing run as short as possible with a minimum number of elbows or bends. Locations where the tubing will be exposed to mechanical damage should be avoided. If it is necessary to use such locations, the copper tubing should be housed to prevent damage. 11
If tubing is to be run underground, it must be run in a sealed watertight chase. Use care in routing tubing and do not kink or twist. Use a tubing bender on the vapor line to prevent kinking. Route the tubing using temporary hangers, then straighten the tubing and install permanent hangers. Line must be adequately supported. The vapor line must be insulated to prevent dripping (sweating) and prevent performance losses. Armaflex and Rubatex are satisfactory insulations for this purpose. Use 1/2 [12.7 mm] minimum insulation thickness, additional insulation may be required for long runs. Check Table 2 for the correct vapor line size. Check Table 3 for the correct liquid line size. 7.5 TUBING CONNECTIONS Indoor coils have only a holding charge of dry nitrogen. Keep all tube ends sealed until connections are to be made. Use type L copper refrigeration tubing. Braze the connections with accepted industry practices. Be certain both refrigerant shutoff valves at the outdoor unit are closed. Clean the inside of the fittings before brazing. Remove the cap and schrader core from service port to protect seals from heat damage. Use an appropriate heatsink material around the copper stub and the service valves before applying heat. IMPORTANT: Do not braze any fitting with the TEV sensing bulb attached. Braze the tubing between the outdoor unit and indoor coil. Flow dry nitrogen into a service port and through the tubing while brazing. The service valves are not backseating valves. To open the valves, remove the valve cap with an adjustable wrench. Insert a 3/16 [4.7 mm] or 5/16 [7.9 mm] hex wrench into the stem. Back out counterclockwise. Replace the valve cap finger tight then tighten an additional 1/2 hex flat for a metal-to-metal seal. 7.6 LEAK TESTING Pressurize line set and coil through service fittings with dry nitrogen to 150 PSIG [1034.2 kpa] maximum. Leak test all joints using liquid detergent. If a leak is found, relieve pressure and repair. 12
TABLE 2 SUCTION LINE LENGTH/SIZE VS CAPACITY MULTIPLIER (R-410A) Unit Size 1 1/2 Ton 2 Ton 2 1/2 Ton 3 Ton 3 1/2 Ton 4 Ton 5 Ton Suction Line Connection Size Suction Line Run - Feet [m] Optional 25 [7.6] Standard Optional Optional 50 [15.24] Standard Optional Optional 100 [30.5] Standard Optional Optional 150 [45.7] Standard Optional 3/4 [19] I.D. 5/8 [15.9] Opt. 3/4* [19] Std. 3/4 [19] I.D. 5/8 [15.9] Opt. 3/4* [19] Std. 3/4 [19] I.D. 5/8 [15.9] Opt. 3/4* [19] Std. 7/8 [22.2] Opt. 3/4 [19] I.D. 5/8 [15.9] Opt. 3/4* [19] Std. 7/8 [22.2] Opt. NOTES: *Standard line size Using suction line larger than shown in chart will result in poor oil return and is not recommended. 7/8 [22.2] I.D. 3/4 [19] Opt. 7/8* [22.2] Opt. 7/8 [22.2] I.D. 7/8 [22.2] Opt. 1 1/8* [28.6] Std. 7/8 [22.2] I.D. 7/8 [22.2] Opt. 1 1/8* [28.6] Std. 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.98 0.98 0.96 0.98 0.99 0.99 0.99 0.99 0.99 0.98 0.99 0.99 0.99 0.99 0.99 0.95 0.95 0.94 0.96 0.96 0.96 0.97 0.96 0.96 0.96 0.97 0.98 0.98 0.98 0.97 0.92 0.92 0.91 0.94 0.94 0.95 0.94 0.93 0.94 0.93 0.95 0.96 0.96 0.97 0.95 13
TABLE 3 LIQUID LINE SIZING (R-410A) System Capacity 1 1/2 Ton 2 Ton 2 1/2 Ton 3 Ton 3 1/2 Ton 4 Ton 5 Ton Line Size Connection Size (Inch I.D.) [mm] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] 3/8 [9.5] Line Size (Inch OD) [mm] Liquid Line Size Outdoor unit above or below indoor coil (Heat Pump Only) Total Equivalent Length - Feet [m] 25 50 75 100 125 150 Maximum Vertical Separation - Feet [m] 1/4 [6.4] 25 [7.6] 40 [12.2] 25 [7.6] 9 [2.7] N/A N/A 5/16 [7.9] 25 [7.6] 50 [15.2] 62 [18.9] 58 [17.7] 53 [16.2] 49 [14.9] 3/8* [9.5] 25 [7.6] 50 [15.2] 75 [22.9] 72 [21.9] 70 [21.3] 68 [20.7] 1/4 [6.4] 23 [7.0] N/A N/A N/A N/A N/A 5/16 [7.9] 25 [7.6] 36 [10.9] 29 [8.8] 23 [7.0] 16 [4.9] 9 [2.7] 3/8* [9.5] 25 [7.6] 50 [15.2] 72 [21.9] 70 [21.3] 68 [20.7] 65 [19.8] 1/4 [6.4] 25 [7.6] N/A N/A N/A N/A N/A 5/16 [7.9] 25 [7.6] 49 [14.9] 38 [11.6] 27 [8.3] 17 [5.2] 6 [1.8] 3/8* [9.5] 25 [7.6] 50 [15.2] 68 [20.7] 65 [19.8] 62 [18.9] 58 [17.7] 5/16 [7.9] 25 [7.6] 50 [15.2] 37 [11.3] 22 [6.7] 7 [2.1] N/A 3/8* [9.5] 25 [7.6] 50 [15.2] 68 [20.7] 63 [19.2] 58 [17.7] 53 [16.2] 5/16 [7.9] 25 [7.6] 23 [7.0] 4 [1.2] N/A N/A N/A 3/8* [9.5] 25 [7.6] 50 [15.2] 43 [13.1] 36 [10.9] 30 [9.144] 24 [7.3] 3/8* [9.5] 25 [7.6] 46 [14.0] 38 [11.6] 30 [9.144] 22 [6.7] 15 [4.5] 1/2 [12.7] 25 [7.6] 50 [15.2] 56 [17.1] 55 [16.8] 53 [16.2] 52 [15.8] 3/8* [9.5] 25 [7.6] 50 [15.2] 56 [17.1] 44 [13.4] 32 [9.8] 20 [6.1] 1/2 [12.7] 25 [7.6] 50 [15.2] 75 [22.9] 81 [24.7] 79 [24.1] 76 [23.2] NOTES: *Standard line size N/A - Application not recommended. 14
8.0 DEMAND DEFROST CONTROL AND 8.0 HIGH/LOW PRESSURE CONTROLS The demand defrost control is a printed circuit board assembly consisting of solid state control devices with electro-mechanical outputs. The demand defrost control monitors the outdoor ambient temperature, outdoor coil temperature, and the compressor run-time to determine when a defrost cycle is required. Enhanced Feature Demand Defrost Control: Has high and low pressure control inputs with unique pressure switch logic built into the microprocessor to provide compressor and system protection without nuisance lock-outs. Cycles the compressor off for 5 seconds at the beginning and end of the defrost cycle to eliminate the increased compressor noise caused by rapidly changiing system pressures when the reversing valve switches. See section 8.7 for diagnostic flash codes for the two diagnostic LED s provided on the control. 8.1 DEFROST INITIATION A defrost will be initiated when the three conditions below are satisfied: 1) The outdoor coil temperature is below 35 F. 2) The compressor has operated for at least 34 minutes with the outdoor coil temperature below 35 F. 3) The measured difference between the ambient temperature and the outdoor coil temperature exceeds a certain threshold. Additionally, a defrost will be initiated if six hours of accumulated compressor run-time has elapsed without a defrost with the outdoor coil temperature below 35 F. 8.2 DEFROST TERMINATION Once a defrost is initiated, the defrost will continue until fourteen minutes has elapsed or the coil temperature has reached the terminate temperature. The terminate temperature is factory set at 70 F, although the temperature can be changed to 50 F, 60 F, 70 F or 80 F by relocating a jumper on the board. 8.3 TEMPERATURE SENSORS The coil sensor is clipped to the top tube on the outdoor coil at the point feed by the distribution tubes from the expansion device (short 3/8 dia. tube). The air sensor is located on the defrost control board. If the ambient sensor fails the defrost control will initiate a defrost every 34 minutes with the coil temperature below 35 F. If the coil sensor fails the defrost control will not initiate a defrost. 8.4 TEST MODE The test mode is initiated by shorting the TEST pins. In this mode of operation, the enable temperature is ignored and all timers are sped up by a factor of 240. To initiate a manual defrost, short the TEST pins. Remove the short when the system switches to defrost mode. The defrost will terminate on time (14 minutes) or when the termination temperature has been achieved. Short TEST pins again to terminate the defrost immediately. 8.5 TROUBLE SHOOTING DEMAND DEFROST OPERATION Set the indoor thermostat select switch to heat and thermostat lever to a call for heat. Jumper the test pins to put the unit into defrost. If the unit goes into defrost and comes back out of defrost, the indication is that the control is working properly. If the unit did not go into defrost using the test pins, check to ensure that 24V is being supplied to the control board. If 24V is present then replace the control. 15
8.6 HIGH/LOW PRESSURE CONTROL MONITORING Status of high and low pressure controls is monitored by the enhanced feature demand defrost control and the following actions are taken. High Pressure Control (optional) Provides active protection in both cooling and heating modes at all outdoor ambient temperatures. The high pressure control is an automatic reset type and opens at approximately 610 psig and closes at approximately 420 psig. The compressor and fan motor will stop when the high pressure control opens and will start again if the high side pressure drops to approximately 420 psig when the automatic reset high pressure control resets. If the high pressure control opens 3 times within a particular call for heating or cooling operation, the defrost control will lock out compressor and outdoor fan operation. Low Pressure Control (standard) Provides active protection in both heating and cooling modes at all outdoor ambient temperatures. The low pressure control is an automatic reset type and opens at approximately 15 psig and closes at approximately 40 psig. Operation is slightly different between cooling and heating modes. Cooling Mode: The compressor and fan motor will stop when the low pressure control opens and will start again when the low side pressure rises to approximately 40 psig when the low pressure control automatically resets. If the low pressure switch opens 3 times within a particular call for cooling operation, the defrost control will lock out compressor and outdoor fan operation. Heating Mode: The compressor and fan motor will stop when the low pressure control opens and will start again when the low side pressure rises to approximately 40 psig when the low pressure control automatically resets. If the low pressure switch trips 3 times within 120 minutes of operation during a particular call for heating operation, the defrost control will lock out compressor and outdoor fan operation. If the lock-out due to low pressure occurs at an outdoor ambient temperature below 5 F, the defrost control will automatically exit the lock-out mode when the outdoor ambient temperature rises to 5 F. This feature is necessary since the low pressure control could possibly heave opened due to the outdoor ambient being very low rather than an actual system fault. Exiting Lock-Out Mode: To exit the lock-out mode, remove 24 volts to the defrost control by removing power to indoor air-handler/furnace or by shorting the two defrost control test pins together. 8.7 ENHANCED FEATURE DEFROST CONTROL DIAGNOSTIC CODES LED 1 LED 2 Control Board Status OFF OFF No Power ON ON Coil Sensor Failure OFF ON Ambient Sensor Failure FLASH FLASH Normal OFF FLASH Low Pressure Lockout (short test pins to reset) FLASH OFF High Pressure Lockout (short test pins to reset) ON FLASH Low Pressure Control Open FLASH ON High Pressure Control Open Alternate Flashing 5 Minute Time Delay 9.0 EVACUATION PROCEDURE The life and efficiency of the equipment is dependent upon the thoroughness exercised by the technician when evacuating air and moisture from the system. Air in the system causes high condensing temperatures and pressure, resulting in increased power input and non-verifiable performance. Moisture chemically reacts with the refrigerant and oil to form corrosive hydrofluoric and hydrochloric acids. These attack motor windings and parts, causing breakdown. After the system has been leak checked and proven sealed, connect the vacuum pump and evacuate system to 500 microns. The vacuum pump must be connected to both the high and low sides of the system through adequate connections. Use the largest size connections available since restrictive service connections may lead to false readings because of pressure drop through the fittings. IMPORTANT: Compressors (especially scroll type) should never be used to evacuate the heat pump system because internal electrical arcing may result in a damaged or failed compressor. 16
10.0 START UP AND PERFORMANCE Even though the unit is factory charged with Refrigerant-410A, the charge must be checked to the charge table attached to the service panel and adjusted, if required. (See Table 1). Allow a minimum of 5 minutes running. Before analyzing charge, see the instructions on the unit service panel rating plate for marking the total charge. 11.0 CHECKING AIRFLOW The air distribution system has the greatest effect on airflow. The duct system is totally controlled by the contractor. For this reason, the contractor should use only industry-recognized procedures. Heat pump systems require a specified airflow. Each ton of cooling requires between 350 and 450 cubic feet [165.2 and 212.4 L/s] of air per minute (CFM) [L/s], or 400 CFM [188.8 L/s] nominally. Duct design and construction should be carefully done. System performance can be lowered dramatically through bad planning or workmanship. Air supply diffusers must be selected and located carefully. They must be sized and positioned to deliver treated air along the perimeter of the space. If they are too small for their intended airflow, they become noisy. If they are not located properly, they cause drafts. Return air grilles must be properly sized to carry air back to the blower. If they are too small, they also cause noise. The installers should balance the air distribution system to ensure proper quiet airflow to all rooms in the home. This ensures a comfortable living space. An air velocity meter or airflow hood can give a reading of the system CFM [L/s]. 12.0 CHECKING REFRIGERANT CHARGE Charge for all systems should be checked against the Charging Chart inside the access panel cover. IMPORTANT: Do not operate the compressor without charge in system. Addition of R-410A will raise pressures (vapor, liquid and discharge). If adding R-410A raises both vapor pressure and temperature, the unit is overcharged. IMPORTANT: Use industry-approved charging methods to ensure proper system charge. 12.1 CHARGING BY LIQUID PRESSURE The liquid pressure method is used for charging systems in the cooling and heating mode. The service port on the liquid (small valve) and suction (large valve) is used for this purpose. Verify that the outdoor unit is running and the indoor air mover is delivering the maximum airflow for this system size. Read and record the outdoor ambient temperature. Read and record the liquid and suction pressures at the ports on the liquid and suction valves. If refrigerant lines are sized using the nameplate charge, the correct liquid pressure is found at the intersection of the suction pressure and the outdoor ambient. 1. Remove refrigerant charge if the liquid pressure is above the chart value. 2. Add refrigerant charge if the liquid pressure is below the chart value. 17
12.2 CHARGING BY WEIGHT For a new installation, evacuation of interconnecting tubing and indoor coil is adequate; otherwise, evacuate the entire system. Use the factory charge shown in Table 1 of these instructions or unit data plate. Note that charge value includes charge required for 15 ft. [4.6 m] of standard size interconnecting liquid line. Calculate actual charge required with installed liquid line size and length using: 1/4 [6.35 mm] O.D. =.3 oz./ft. [8.5 g/m] 5/16 [7.9 mm] O.D. =.4 oz./ft. [11.3 g/m] 3/8 [9.5 mm] O.D. =.6 oz./ft. [17 g/m] 1/2 [12.7 mm] O.D. = 1.2 oz./ft. [34 g/m] With an accurate scale (+/ 1 oz.) or volumetric charging device, adjust charge difference between that shown on the unit data plate and that calculated for the new system installation. If the entire system has been evacuated, add the total calculated charge. 12.3 FINAL LEAK TESTING After the unit has been properly evacuated and charged, a halogen leak detector should be used to detect leaks in the system. All piping within the condensing unit, evaporator, and interconnecting tubing should be checked for leaks. If a leak is detected, the refrigerant should be recovered before repairing the leak. The Clean Air Act prohibits releasing refrigerant into the atmosphere. 13.0 ELECTRICAL WIRING NOTE: Check all wiring to be sure connections are securely fastened, electrically isolated from each other and that the unit is properly grounded.! WARNING Turn off electric power at the fuse box or service panel before making any electrical connections. Also, the ground connection must be completed before making line voltage connections. Failure to do so can result in electrical shock, severe personal injury or death. Field wiring must comply with the National Electric Code (C.E.C. in Canada) and any applicable local code. 13.1 POWER WIRING It is important that proper electrical power from a commercial utility is available at the heat pump contactor. Voltage ranges for operation are shown in Table 4. Install a branch circuit disconnect within sight of the unit and of adequate size to handle the starting current (see Table 1). Power wiring must be run in a rain-tight conduit. Conduit must be run through the connector panel below the access cover (see Figure 1) and attached to the bottom of the control box. Connect power wiring to contactor located in outdoor heat pump electrical box. (See wiring diagram attached to unit access panel.) Check all electrical connections, including factory wiring within the unit and make sure all connections are tight. DO NOT connect aluminum field wire to the contactor terminals. 13.2 GROUNDING A grounding lug is provided near the contactor for a ground wire.! WARNING The unit must be permanently grounded. Failure to do so can cause electrical shock resulting in severe personal injury or death. 18
TABLE 4 VOLTAGE RANGES (60 HZ) Operating Voltage Range at Copeland Nameplate Voltage Maximum Load Design Conditions for Compressors 208/230 (1 Phase) 187-253 13.3 CONTROL WIRING (See Figure 5) If the low voltage control wiring is run in conduit with the power supply, Class I insulation is required. Class II insulation is required if run separate. Low voltage wiring may be run through the insulated bushing provided in the 7/8 [22.2 mm] hole in the base panel, up to and attached to the pigtails from the bottom of the control box. Conduit can be run to the base panel if desired by removing the insulated bushing. A thermostat and a 24 volt, 40 VA minimum transformer are required for the control circuit of the condensing unit. The furnace or the air handler transformer may be used if sufficient. See the wiring diagram for reference. FIGURE 5 CONTROL WIRING FOR AIR HANDLER Air Handler W2 G Y W1 B ODD C W/BL G/BK Y W/BK BL G/Y BR B Heat Pump Thermostat Y G W2 E C R TYPICAL THERMOSTAT: HEAT PUMP WITH ELECTRIC HEAT Heat Pump Outdoor Unit Y B C R D NOTES: 1. Jumper E to W2 to transfer control of supplemental heat to 1st stage when the emergency heat switch is on. 2. This wire turns on heat for defrost, omit for most economical operation. 3. Wire with colored tracing stripe. R R Y WIRING INFORMATION Line Voltage -Field Installed -Factory Standard NOTE: RED WIRE REQUIRED WITH RANCO DDL DEMAND DEFROST CONTROL. 14.0 FIELD INSTALLED ACCESSORIES 14.1 COMPRESSOR CRANKCASE HEATER (CCH) While scroll compressors usually do not require crankcase heaters, there are instances when a heater should be added. Refrigerant migration during the off cycle can result in a noisy start up. Add a crankcase heater to minimize refrigeration migration, and to help eliminate any start up noise or bearing wash out. 19
TABLE 5 MAXIMUM SYSTEM CHARGE VALUES 13 & 14.5 SEER 13 SEER Maximum Charge Values Model Compressor Charge Limit Without Size Model Number Crankcase Heater 18 ZP16K5E-PFV 9.6 lbs. [66.1 kpa] 18 H82J13BABCA * 24 ZP21K5E-PFV 9.6 lbs. [66.1 kpa] 30 ZP25K5E-PFV 9.6 lbs. [66.1 kpa] 30 H81J22BABCA * 36 ZP31K5E-PFV 9.6 lbs. [66.1 kpa] 36 HRH031U1LP6 9.6 lbs. [66.1 kpa] 42 ZP36K5E-PFV 12 lbs. [82.65 kpa] 42 HRH036U1LP6 9.6 lbs. [66.1 kpa] 48 ZP42K5E-PFV 12 lbs. [82.65 kpa] 60 ZP54K5E-PFV * *These compressors come with factory installed crankcase heaters. 14.5 SEER Maximum Charge Values Model Compressor Charge Limit Without Size Model Number Crankcase Heater 18 ZP16K5E 9.6 lbs. [66.2 kpa] 24 ZP21K5E 9.6 lbs. [66.2 kpa] 30 ZP25K5E 9.6 lbs. [66.2 kpa] 36 ZP31K5E 9.6 lbs. [66.2 kpa] 42 ZP34K5E 12 lbs. [82.7 kpa] NOTE: Model sizes 48 and 60 have a factory installed crankcase heater. NOTE: The installation of a crankcase heater is recommended if the system charge exceeds the values in Table 5. All heaters are located on the lower half of the compressor shell. Its purpose is to drive refrigerant from the compressor shell during long off cycles, thus preventing damage to the compressor during start-up. At initial start-up or after extended shutdown periods, make sure the heater is energized for at least 12 hours before the compressor is started. (Disconnect switch on and wall thermostat off.) 14.2 LOW AMBIENT CONTROL (LAC) COOLING MODE ONLY - RXAD-A08 This component senses compressor head pressure and shuts the heat pump fan off when the head pressure drops to approximately 220 PSIG [1516.8 kpa]. This allows the unit to build a sufficient head pressure at lower ambient in order to maintain system balance and obtain improved capacity. Low ambient control should be used on all equipment operated below 70 F [21.1 C] ambient. 14.3 HIGH PRESSURE CONTROL (HPC) This control keeps the compressor from operating in pressure ranges which can cause damage to the compressor. This control is in the low voltage control circuit. High pressure control (HPC) is a manual reset which opens near 610 PSIG [4205.8 kpa]. Do not reset arbitrarily without first determining what caused it to trip. 14.4 HEAT PUMP THERMOSTAT WARNING LIGHT KIT RXPX-D01 This component senses a compressor lock out and tells the thermostat service light to come on. This will let the homeowner know that service is needed on the system. NOTE: Warning light on thermostat will come on during a 5 minute compressor time delay and for 5 seconds during defrost while the compressor is off. Homeowner should only be concerned if light stays on for more than 5 minutes. 15.0 SERVICE 15.1 SINGLE-POLE COMPRESSOR CONTACTOR (CC) CAUTION Single-pole contactors are used on all standard single-phase units up through 5 tons. Caution must be exercised when servicing as only one leg of the power supply is broken with the contactor. 20
16.0 TROUBLE SHOOTING In diagnosing common faults in the heat pump system, develop a logical thought pattern as used by experienced technicians. The charts which follow are not intended to be an answer to all problems but only to guide the technician s thinking. Through a series of yes and no answers, follow the logical path to a likely conclusion. A novice technician should use these charts like a road map. Remember that the chart should clarify a logical path to the problem s solution. 16.1 ELECTRICAL CHECKS FLOW CHART Unit Running? NO YES Thermostat Problem? Go to Mechanical Checks YES NO for Cooling or Heating Repair and Recheck Transformer Problem? YES Repair and Recheck NO Voltage on Compressor Side of Contactor? YES NO Run Capacitor Voltage on Line Side of Contactor? Start Capacitor Potential Relay Compressor Internal Overload Open Compressor Winding Open NO Circuit Breakers or Fuses Open YES YES Compressor Contactor Hi Pressure Cut-Out Hot Gas Sensor Compressor Winding Unit Wiring and Grounded Compressor Time-Delay Connections Outdoor Fan Motor Grounded Unit Wiring and Connections Grounded Capacitor Replace Fuses or Reset Breakers and Recheck System 21
16.2 COOLING MECHANICAL CHECKS FLOW CHART Unit Running? YES NO Pressure problems? Go to Electrical Checks Flow Chart High Head Pressure Low Head Pressure Low Suction Pressure Dirty Outdoor Coil Low on Charge Dirty Filters Inoperative Outdoor Fan Open IPR Valve Dirty Indoor Coil Overcharge Low Ambient Temperature Inadequate Indoor Air Flow Recirculation of Inoperative Compressor Broken Indoor Outdoor Air Valves Blower Belt Non-condensibles Outdoor Check Valve Inoperative Indoor Blower Closed Higher than Ambient Air Entering Outdoor Coil Low on Charge Restricted Indoor Restricted Indoor Wrong Outdoor Fan Rotation Metering Device Metering Device Restricted Filter Drier Reversing Valve Failure Restriction in System Recirculation of Indoor Air Wrong Indoor Blower Rotation Inadequate Ducts Outdoor Check Valve Closed Restricted Filter Drier 22